HI Alex,
Does the ticket handle all 4 below apis? There is no confirmation on it.
Reader:
https://docs.sencha.com/extjs/7.7.0/modern/Ext.data.reader.Json.html#method-getResponseData
https://docs.sencha.com/extjs/7.7.0/modern/Ext.data.reader.Json.html#cfg-transform
Writer:
https://docs.sencha.com/extjs/7.7.0/modern/Ext.data.writer.Json.html#method-writeRecords
https://docs.sencha.com/extjs/7.7.0/modern/Ext.data.writer.Json.html#cfg-transform